IEC 62305-3:2010

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Lightning protection system (LPS)
5 External lightning protection system
6 Internal lightning protection system
7 Maintenance and inspection of an LPS
8 Protection measures against injury to living
  beings due to touch and step voltages
Annex A (normative) - Positioning the air-termination
        system
Annex B (normative) - Minimum cross-section of the
        entering cable screen in order to avoid
        dangerous sparking
Annex C (informative) - Evaluation of the separation
        distance s
Annex D (normative) - Additional information for LPS
        in the case of structures with a risk of explosion
Annex E (informative) - Guidelines for the design,
        construction, maintenance and inspection
        of lightning protection systems
Bibliography

IEC 62305-3:2010 provides the requirements for protection of a structure against physical damage by means of a lightning protection system (LPS), and for protection against injury to living beings due to touch and step voltages in the vicinity of an LPS (see IEC 62305-1). This second edition cancels and replaces the first edition, published in 2006, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
1) Minimum thicknesses of metal sheets or metal pipes given in Table 3 for air-termination systems are assumed as not able to prevent hot-spot problems.
2) Steel with electro-deposited copper is introduced as material suitable for LPS.
3) Some cross-sectional areas of LPS conductors were slightly modified.
4) For bonding purposes, isolating spark gaps are used for metal installations and SPD for internal systems.
5) Two methods simplified and detailed are provided for evaluation of separation distance.
6) Protection measures against injuries of living beings due to electric shock are considered also inside the structure.
7) Improved information for LPS in the case of structures with a risk of explosion are given in Annex D (normative).
This bilingual version (2012-06) corresponds to the monolingual English version, published in 2010-12.